ML20064G556
| ML20064G556 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 12/04/1978 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7812120083 | |
| Download: ML20064G556 (52) | |
Text
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d VIRGINIA Ez.zcruzc Axn Powen CoxrAxy Rrcnxoxn,Vamonw sA 20261 December 4, 1978 Mr. Harold R. Denton, Director Serial No. 651 Office of Nuclear Reactor Regulation P0/KEB:scj Atta:
Mr. O. D. Parr, Chief Docket No. 50-339 Light Water Reactors Branch No. 3 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
As stated in our letter of July 7, 1978, Serial No. 380, the preservice inspection for North Anna Power Station, Unit No. 2, is being performed, to the extent practical, in accordance with the requirements of Section XI of the 1974 Edition of the ASME Code, with Addenda through the Sunamer of 1975.
Since the North Anna Unit No. 2 system design and ordering of long lead time components were well underway by the time the first Edition of the ASME Section II inservice inspection rules became effective, full compliance with the access and inspectability requirements would be difficult to achieve.
Therefore, pursuant to 10 CFR 50.55a(g)(6)(i), we request specific exceptions to preservice examination requirements.
At the present time the preservice examination is approximately 30%
complete on Unit No. 2.
The request for relief is based on 100% completion.
Consequently some of the requests are based on design and the results of the Unit No. 1 examinations.
The attached request for relief is based on ASME Section II Table IWB -
2600 and is in the format used for the Unit No. I submittal including the additional information requested by your staff. Table 1 lists the percentage of preservice examination requirements which were met in those areas for which relief has been requested as well as the measures required to make the welds accessible for preservice examination. Table 2 lists the specific welds, in categories B-F and B-J, which were not subjected to complete preservice examination. Reference sketches showing the location of each l
weld are also e rided.
The code addenda to which North Anna Unit No. 2 was constructed, required cot radiographic examinations of the welds in the reactor vessel and
. piping systems. In addition field pipe welds received a surface a-
=1 examination.
l 781212006.3
Vinoaxta Etzc;src AND Powra Coxnxv T Mr. Harold R. Denton 2
Since for North Anna Unit No. 2,10 CFR 50.55a(g)(2) requires that the preservice inspection conform with Section II, 1970 Edition, the requests for relief of Class 2 and 3 components will be submitted with our initial inservice inspection program description. This is consistant with your evaluation of our Unit No. I submittals.
We trust that the enclosed information is sufficient for you to approve our request for specific exemptions from the requirements of ASME Section II for preservice inspection for North Anna Unit No. 2.
Very truly yours, k.
WlYf C. M. Stallings Vice President-Power Supply and Production Operations Attachments I
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I Table i lorth Anna Unit 2 Preservice Inapection ASME CODE Class ! Components Tal.le lable System or Area to be Examination Section XI Extent of Heasures required IWB-2600 IWu-2500 Component Examined Requirement Code Relief PSI Coverage for accessability Itera No.
Examination Mequest vs.Section XI Category Bl.3 ti-C Reactor vessel Closure Head Volumetric See Notes 95%
See Note 4 to Flange Weld 162 Bl.18
!!-0 Control Rod Volumetric See Notes 100%
N/A Drive llousings 163 H2.1 Il-H Pressurizer Longitudinal and Volumetric See Note 5 92%
Remov.nl of seismic circumferential restraints welds h2.2 Il-D Nozzle to Vessel Volumetric See Note 6 80%
See Note 7 welds h2.4 H-F Nozzle to safe-Volumetric See Note 8 90%
See Note 7 I
end welds and Surface H2.8 H-Il Integrally-Volumetric See Note 9 92%
See Note 4 welded supports h3.3 Il-F Steam Genera-Nozzle-to-safe Volumetric See Note 8 80%
See Note 7 tors end welds and surface 1
15 4. 1 Il-F Piping Safe end to Volumetric See Note 8 88%
See Note 7 4
Pressure pipe welds and surface lloundary B4.5 Il-J Circumferential Volumetric See Notes 95%
See Note 7 4
and longitudinal 8 & 10 pipe welds B4.6 H.I Branch Connections Volumetric See Note 11 20%
See Note 7 exceedia.g six inches diameter B4.9 Il-K-1 Integrally Volumetric See Note 12 20%
See Note 7 I
welded supports.
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Notes:
- 1) This item has not been examir.ed at tha time of this submittal.
The request for relief is based upon design review of the item and examination results of the Unit ao. I preservice inspection; and, is believed to be accurate due te similar designs and configurations between the two Units.
- 2) The geometric configuration of the flange limits the extent to which ultrasonic examinations can be performed from the lower side o'f the weld. Examinations as required by I-2300 will be performed to the extent practical.
- 3) IWB-2100 states that for preservice examinations essentially 100%
of the peripheral housings shall be examined. Several of the peripheral housings may not be accessible due to special insulation construction. Housings on the inner portion of the head which are not accessible will be substituted for the peripheral ones not examined. The equivalent total of the peripheral housings will be examined.
- 4) Examination coverage limited by design, no additional work could improve examination coverage.
- 5) In instances where the location of insulation supports and seismic supports restrict the access available for the examination of pressurizer welds as required by IWB-2600, examinations were performed to the extent practical.
- 6) The veld and adjacent base on the head side was completely examined by angle beam as required by I-2310. The geometric configuration of the nozzle is such that no examination can be performed from the nozzle side of the weld. This limitation is reported in the examination data as required by I-5121.
- 7) Examination coverage limited due to configuration, no additional work would improve examination coverage.
- 8) The arrangements and details of the piping systems and components are such that some examinations as required by IW3-2600 are limited due to geometric configuration or accessibility. Generally, these limitations exist at pipe to fitting welds, where examinations enn only be fully performed from the pipe side, the fitting geccetry limiting or even precluding examination from the opposite side.
Welds having such restrictions were examined to the extent practical.
Relief request is for the volumetric method.
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- 9) The pressurizer support skirt weld could not be examined to the extent required by IWB-2500 due to the design of the support member. Examination was performed to the extent practical.
- 10) In instances where the location of pipe supports or hangers restricts the access available for the examination of pipe welds as required by IWB-2600, examinations were performed to the extent practical unless removal of the support was permissible without unduly stressing the system. Of the welds that did not meet the requirements of Section XI, 94* were due to piping configuration and fitting welds; 3% were due to nonremovable supports; and 3% were due to miscellaneous items, i.e. floor grating, etc.
- 11) The geome'.ric configuration of the weld surface prevents ultrasonic examinations from being performed to the extent required by IWB-2000.
Examinations were performed to the extent practical from the pipe and nozzle surfaces adjacent to the weld. Surface examination of the welds were performed to supplement the volumetric examination.
- 12) The piping system integrally welded supports are attached to the pipe by fillet welds. The configurations of such welds was such that examinations could not be performed to the extent required by IWB-2600 and only the base material of the pipe wall could be examined by ultrasonic techniques. Surface examinations were performed on the integrally welded attachments to supplement the limited volumetric examinations.
- 13) The reactor coolant pump seal housing bolts are of the socket head type and the configuration is such that ultrasonic examinations as required by IWB-2600 could not be performed when bolting is in place. Examinations can only be performed to the extent required by IWB-2600 when the seal housing is disassembled for maintenance.
- 14) This examination to the extent required by IWB-2600 will only be performed when the pump or valve is disassembled for maintenance purposes or at the end of the 10 year interval when disassembly is undertaken for the performance of pump casing or valve body examina-tions.
Table 2 Sketches Showing Location of Welds In Examination Categories B-F and B-J For Which Relief Has Been Requested Preservice Inspection for North Anna Unit 2 Sketch No.
Weld No.
Sketch No.
Weld No.
VGB-1-4100 2
VGB-1-4106 16 3
17 8
9 VGB-1-4107 18 10 11 VGB-1-4108 2
12 3
13 6
7 VG3-1-4101 1
8 3
12 13 VGB-1-4102 1
14 9
10 VGB-1-4109 1
11 12 VGB-1-4110 19 13 15 VGB-1-4111 2
3 4
VGB-1-4103 1
5 6
6 7
7 10 10 11 VGB-1-4104 1
12 2
13 3
14 7
15 19 VGB-1-4105 1
20 3
21 6
22 8
30 9
12 VGB-1-4114 64 19 65 26 28 VG3-1-4200 2
31 3
41 8
42 9
43 10 11 VGB-1-4106 2
12 1
3 13 6
10 VGB-1-4201 1
11 6
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Table 2 (cont.)
Sketches Showing Location of Welds In Examination Gategories B-F and B-J For Which Relief Has Been Requested Preservice Inspection for North Anna Unit 2 Sketch No.
Weld No.
Sketch No.
Weld No.
VGB-1-4201 7
VGB-1-4207 14 14 15 15 16 17 17 18 VGB-1-4202 1
19 2
20 5
21 22 VGB-1-4203 1
6 VGB-1-4208 18 7
10 VGB-1-4209 1
VGB-1-4204 1
VGB-1-4210 19 2
3 VGB-1-4211 5
7 8
i 9
i VGB-1-4205 1
11 8
12 12 13 14 14 40 15 41 16 37 VGB-1-4206 1
40 2
41 3
42 4
5 VGB-1-4214 63 6
7 VGB-1-4300 2
8 3
9 8
9 VGB-1-4207 1
10 2
11 3
12 I
4 13 5
14 6
7 VGB-1-4301 1
8 10 9
11 10 11 VGB-1-4302 1
12 4
13 5
)
Table 2 (cont.)
Sketches Showing Location of Welds In Examination Categories B-F and B-J For Which Relief Has Been Requested Preservice Inspection for North Anna Unit 2 Sketch No.
Weld No.
Sketch No.
Weld No.
VGB-1-4302 6
VGB-1-43C7 18 8
19 13 20 14 21 16 22 23 VGB-1-4303 1
7 VGB-1-4308 20 VGB-1-4304 1
VGB-1-4309 1
6 7
VGB-1-4310 19 10 VUB-1-4311 8
VGB-1-4305 1
9 2
10 3
11 6
12 7
13 14 VGB-1-4306 1
15 3
14 VGB-1-4500 1
16 2
17 8
18 9
22 10 23 11 25 17 34 18 35 19 36 20 26 VGB-1-4307 1
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2 3
VGB-1-4501 1
4 15 5
16 6
17 7
21 8
22 9
23 11 28 12 29 13 14 VGB-1-4502 1
15 2
16 3
17 4
b Table 2 (cont.)
Sketches Showing Location of Welds In Examination Categories B-F and B-J For Which Relief Has Been Requested Preservice Inspection for North Anna Unit 2 Sketch No.
Weld No.
Sketch No.
' Weld No.
VGB-1-4502 5
VGB-1-4600 1
6 3
7 4
8 6
9 7
12 9
13 10 14 11 15 12 16 13 17 14 19 15 20 16 21 18 22 19 30 20 31 21 32 22 33 23 35 24 36 25 37 26 4
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35 7
36 8
37 9
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